Re: [RFC PATCH v1 01/18] x86: Set the write-protect cache mode for AMD processors

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Subject: Re: [RFC PATCH v1 01/18] x86: Set the write-protect cache mode for AMD processors
From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Date: Wed, 27 Apr 2016 07:33:21 -0700
Cc: linux-arch <linux-arch@xxxxxxxxxxxxxxx>, "linux-efi@xxxxxxxxxxxxxxx" <linux-efi@xxxxxxxxxxxxxxx>, kvm list <kvm@xxxxxxxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>
In-reply-to: <20160426225604.13567.55443.stgit@tlendack-t1.amdoffice.net>

On Tue, Apr 26, 2016 at 3:56 PM, Tom Lendacky <thomas.lendacky@xxxxxxx> wrote:
> For AMD processors that support PAT, set the write-protect cache mode
> (_PAGE_CACHE_MODE_WP) entry to the actual write-protect value (x05).

What's the purpose of using the WP memory type?

--Andy
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Follow-Ups:
- Re: [RFC PATCH v1 01/18] x86: Set the write-protect cache mode for AMD processors
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References:
- [RFC PATCH v1 00/18] x86: Secure Memory Encryption (AMD)
  - From: Tom Lendacky
- [RFC PATCH v1 01/18] x86: Set the write-protect cache mode for AMD processors
  - From: Tom Lendacky

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